From: len
Subject: Newbie problem not sure where
Date: Sun, 24 Jun 2007 16:28:13 +0000
Message-ID: <1182702493.751521.310570@k79g2000hse.googlegroups.com>

Hi

I am running an HP laptop using Ubuntu feisty fawn.  I am using  the
book 'ANSI Common Lisp' by Paul Graham to try and learn Lisp.  On page
16 of the book it gives the following code as an example of Recursion;

(defun our-member (obj lst)
    (if (null lst)
        nil
        (if (eql (car lst) obj)
            lst
            (our-member obj (cdr lst)))))

Now, I type this code into emacs using slime and it appears to just
hang emacs.  I can't close it, I can still type in the screen but
nothing happens.  I am using cmucl for lisp.

Any help appreciated

Len Sumnler
Lisp Newbie

• Re: Newbie problem not sure where Steven E. Harris
• Re: Newbie problem not sure where Bernd Schmitt
• Re: Newbie problem not sure where Andreas Davour

From: Steven E. Harris
Subject: Re: Newbie problem not sure where
Date: Mon, 25 Jun 2007 00:23:47 +0000
Message-ID: <83wsxsriek.fsf@torus.sehlabs.com>

len <······@comcast.net> writes:

> Now, I type this code into emacs using slime and it appears to just
> hang emacs.

Did you get as far as actually calling the function? If so, did you pass
it a circular list?

-- 
Steven E. Harris

From: Bernd Schmitt
Subject: Re: Newbie problem not sure where
Date: Sun, 24 Jun 2007 18:19:56 +0000
Message-ID: <467eb5c6$0$25769$9b622d9e@news.freenet.de>

Hi,

On 24.06.2007 18:28, len wrote:

here is a newbie-answer ;)
I started slime, opened a new file and put in your/Grahams code:
> (defun our-member (obj lst)
>     (if (null lst)
>         nil
>         (if (eql (car lst) obj)
>             lst
>             (our-member obj (cdr lst)))))

then i saved the file and pressed C-c C-k in that buffer.
C-c C-k runs the command slime-compile-and-load-file.
Everything was ok.
After that i used your function in *slime-repl sbcl*:
CL-USER> (our-member 5 (list 1 2 3 4 5 6 77 9 ))
(5 6 77 9)

So, this seems ok to me (I am using Linux/Slime/SBCL).


Regards,
Bernd

From: Andreas Davour
Subject: Re: Newbie problem not sure where
Date: Sun, 24 Jun 2007 20:07:28 +0000
Message-ID: <cs9myypru9r.fsf@Psilocybe.Update.UU.SE>

len <······@comcast.net> writes:

> Hi
>
> I am running an HP laptop using Ubuntu feisty fawn.  I am using  the
> book 'ANSI Common Lisp' by Paul Graham to try and learn Lisp.  On page
> 16 of the book it gives the following code as an example of Recursion;
>
> (defun our-member (obj lst)
>     (if (null lst)
>         nil
>         (if (eql (car lst) obj)
>             lst
>             (our-member obj (cdr lst)))))
>
> Now, I type this code into emacs using slime and it appears to just
> hang emacs.  I can't close it, I can still type in the screen but
> nothing happens.  I am using cmucl for lisp.

Another newbie answer:

Works like it should in my CMUCL/Debian.

/andreas

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